Huona (Shanghai) New Material Co., Ltd.  

Product Name: 4j29 Kovar Alloy Tube with Fe-Ni-Co Glass Sealed Alloy Model NO.: 4j29 Classification: Feni29co17 OEM: Yes Stock: Seyn Sample: Free Density: 8.2 g/cm3 Resisivity: 0.48 Curie Point: 430 State: Soft 1/4hard 1/2hard Hard T-Hard Brand: 4j29 Chemical Composition: Feni29co17 Elongation: More Than 25% Surface: Bright MOQ: 30 Kgs Material: Ni-Cr-Fe Trademark: HUONA Transport Package: Export Packing Specification: Can discuss Origin: Shanghai HS Code: 75052200 Product Description 4j29 Kovar Alloy Tube With Fe-Ni-Co Glass Sealed AlloyKovar4J29 (Expansion alloy)(Common Name: Kovar, Nilo K, KV-1, Dilver Po,Vacon 12)General DescriptionKovar is a nominal 29%Ni-17%Co-54%Fe alloy that is a well-known glass-sealing alloy suitable for sealing to hard glasses. Kovar has a nominal expansion coefficient of approximately 5 ppm/°C and inflection temperature of ~450 °C (840 °F).4J29 also known asFe-Ni-Co Glass Sealing Alloy. it was invented to meet the need for a reliable glass-to-metal seal, which is required in electronic devices such as light bulbs, vacuum tubes, cathode ray tubes, and in vacuum systems in chemistry and other scientific research.Kovar(ASTM F15)has been used for making hermetic seals with the harder Pyrex glasses and ceramic materials. This alloy has found wide application in power tubes, microwave tubes, transistors, and diodes. In integrated circuits, it has been used for the flat pack and the dual-in-line package.Mainly used in electric vacuum components and emission control, shock tube, igniting tube, glass magnetron, transistors, seal plug, relay, integrated circuits lead, chassis, brackets and other housing sealing.Chemical DompositionalloyCMnSiPSNiCrCoCuMoFe4J29≤0.03≤0.50≤0.30≤0.020≤0.02028.5~29.5≤0.2016.8~17.8≤0.2≤0.2balanceTensile Strength, MPaCode of conditionConditionWireStripRSoft≤585≤5701/4I1/4 Hard585~725520~6301/2I1/2 Hard655~795590~7003/4I3/4 Hard725~860600~770IHard≥850≥700Typical Physical propertiesDensity (g/cm3)8.2Electrical resistivity at 20ºC(OMmm2/m)0.48Temperature factor of resistivity(20ºC~100ºC)X10-5/ºC3.7~3.9Curie pointTc/ºC430Elastic Modulus,E/ Gpa138The heat treatment processAnnealing for stress reliefHeated to 470~540ºC and hold 1~2 h. Cold downannealingIn vacuum heated to 750~900ºCHolding time14 min~1h.Cooling rateNo more than 10 ºC/min cooled to 200 ºCCoefficient of expansionθ/ºCα1/10-6ºC-1θ/ºCα1/10-6ºC-120~607.820~5006.220~1006.420~5507.120~2005.920~6007.820~3005.320~7009.220~4005.120~80010.220~4505.320~90011.4Thermal conductivityθ/ºC100200300400500λ/ W/(m*ºC)20.621.522.723.725.4Style of supplyAlloys NameTypeDimension4J29WireD= 0.1~8mm4J29StripW= 5~250mmT= 0.1mm4J29FoilW= 10~100mmT= 0.01~0.1mm4J29BarDia= 8~100mmL= 50~1000mmFAQ1. What's the minimum quantity customer can order?If we have your size in stock, we can provide any quantity you want.If we do not have, for spool wire, we can produce 1 spool, about 2-3kg. For coil wire, 25kg.2. How can you pay for small sample amount?We have Western union account, wire transfer for sample amount also ok.3. Customer do not have express account. How will us arrange the delivery for sample order?Just need to provide your address information, we will check the express cost, you can arrange the express cost together with sample value.4. What's our payment terms?We can accept LC T/T payment terms, it also depending on delivery and total amount. Let's talk more in details after getting your detailed requirements.5. Do you provide free samples?If you want several meters and we have stock of your size, we can provide, customer need to bear the International express cost.6. What's our working time?We will give you reply through email/phone online contact tool within 24 hours. No matter working day or holidays.